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authorMing Lei <tom.leiming@gmail.com>2013-12-26 21:31:37 +0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-12 16:22:42 +0700
commit518d00b7498c5894be94545848d55e5b9c55749e (patch)
tree841f92409aca75ab2eadea1955d96c33b107395a /drivers
parent228fdc083b017eaf90e578fa86fb1ecfd5ffae87 (diff)
downloadlinux-518d00b7498c5894be94545848d55e5b9c55749e.tar.bz2
block: null_blk: fix queue leak inside removing device
When queue_mode is NULL_Q_MQ and null_blk is being removed, blk_cleanup_queue() isn't called to cleanup queue, so the queue allocated won't be freed. This patch calls blk_cleanup_queue() for MQ to drain all pending requests first and release the reference counter of queue kobject, then blk_mq_free_queue() will be called in queue kobject's release handler when queue kobject's reference counter drops to zero. Signed-off-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/null_blk.c10
1 files changed, 2 insertions, 8 deletions
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index a2e69d26266d..83a598ebb65a 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -425,10 +425,7 @@ static void null_del_dev(struct nullb *nullb)
list_del_init(&nullb->list);
del_gendisk(nullb->disk);
- if (queue_mode == NULL_Q_MQ)
- blk_mq_free_queue(nullb->q);
- else
- blk_cleanup_queue(nullb->q);
+ blk_cleanup_queue(nullb->q);
put_disk(nullb->disk);
kfree(nullb);
}
@@ -578,10 +575,7 @@ static int null_add_dev(void)
disk = nullb->disk = alloc_disk_node(1, home_node);
if (!disk) {
queue_fail:
- if (queue_mode == NULL_Q_MQ)
- blk_mq_free_queue(nullb->q);
- else
- blk_cleanup_queue(nullb->q);
+ blk_cleanup_queue(nullb->q);
cleanup_queues(nullb);
err:
kfree(nullb);